eXist 中的 FLWOR 查询给出:XML 解析错误:未找到根元素 [英] FLWOR query in eXist gives: XML Parsing Error: no root element found

问题描述

我希望将最简单的 FLWOR 从 BaseX 调整为 eXist，如下所示.

I'm looking to adapt the simplest possible FLWOR possible from BaseX to eXist as below.

eXist 中的错误:

XML Parsing Error: no root element found
Location: http://localhost:8080/exist/rest/db/scripts/notes.xq
Line Number 1, Column 1:

查询:

xquery version "3.0";


for $note in collection("/db/temp/notes")


return $note

集合:

<notes>


<note>
foo
</note>


<note>
bar
</note>


<note>
baz
</note>

</notes>

来自BaseX:

nicholas@mordor:~/basex$ 
nicholas@mordor:~/basex$ cat notes.xq 

xquery version "3.1";


for $note in db:open("notes")

return $note
nicholas@mordor:~/basex$ 
nicholas@mordor:~/basex$ basex notes.xq
[warning] /usr/bin/basex: Unable to locate /usr/share/java/tagsoup.jar in /usr/share/java
[warning] /usr/bin/basex: Unable to locate /usr/share/java/xml-resolver.jar in /usr/share/java
[warning] /usr/bin/basex: Unable to locate /usr/share/java/jing.jar in /usr/share/java
<notes>
  <note>foo</note>
  <note>bar</note>
  <note>baz</note>
</notes>nicholas@mordor:~/basex$ 
nicholas@mordor:~/basex$ 

不确定如何将其调整为上述 eXist.

not sure how to adapt that to eXist as above.

次要问题是这是 3.0 并且 eXist 使用 3.1，否则我希望它是可移植的.那么，一定是出现了一些语法或配置错误吗?

Minor point being that this is 3.0 and eXist is using 3.1, otherwise I'd expect it to be portable. So, must be making some syntax or configuration error?

不确定如何使用控制台"；在 eXist 中所以来自 eXide:

Not sure how to use a "console" in eXist so from eXide:

和

这个查询:

xquery version "3.0";


for $notes in collection('/db/temp')


return $notes

返回一个空白页.数据在文件"中.

returns a blank page. The data is in a "file" named notes.xml in /db/tmp as above.

我添加了一个 xml 声明:

I added an xml declaration of:

<?xml version="1.0" encoding="UTF-8" ?>

同样，到数据xml文档.

推荐答案

看起来您在/db/tmp 中有两个 XML 文件(不是/db/temp).我假设 note.xml 是单个 ... 文档，notes.xml 是 ... 包含三个 ... 元素的文档.

It looks like you have two XML files in /db/tmp (not /db/temp). I assume that note.xml is a single <note>...</note> document and notes.xml is the <notes>...</notes> document containing three <note>...</note> elements.

您看到的错误是因为您没有从集合中请求任何元素.也就是说，一旦有了集合，就需要使用 XPath 语句指定该集合中的元素.

The error you are seeing is because you are not requesting any elements from the collection. That is, once you have a collection, you need to specify the elements within that collection with an XPath statement.

请试试这个:

xquery version "3.0";

for $note in collection('/db/tmp')//note
  return $note

//注意"将获取集合中每个文档根元素下的所有 ...</note> 元素.这应该返回 notes.xml 中的三个 <note>...</note> 标签加上 <note>...</note> note.xml 中的文档.

The "//note" will get all <note>...</note> elements below each document's root element in the collection. This should return the three <note>...</note> tags in the notes.xml plus the <note>...</note> document in note.xml.

如果您将查询的 XPath 部分更改为/notes/note"那么您将只能从 notes.xml 文档中获得三个.这是因为 note.xml 文档的根目录中没有 ... 元素.

If you change the XPath portion of the query to "/notes/note" then you'll only get the three from the notes.xml document. That is because the note.xml document does not have a <notes>...</notes> element in its root.

您是对的，在这种情况下，XQuery 3.0 或 3.1 版并不重要.在这个简单的查询中没有 3.1 函数.

You are correct in that XQuery version 3.0 or 3.1 doesn't matter in this case. There are no 3.1 functions in this simple of a query.

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